JOURNAL OF MICROSCOPICAL SCIENCE. 



DESCRIPTION OF PLATE VL, 

 Illustratino^ Dr. Johnston's Paper on the Mosquito. 



Fig. 



1. — Head of male mosquito, magnified 20 diameters. 



2. — Orbital rings supporting the capsules. 



3. — Auditory capsule (sectional view). 



4. — Two joints of antenna. 



5. — Diagram of auditory (i') and antcnnar nerve. 



DESCRIPTION OF PLATE VL, 

 Illustrating Dr. Webb's Paper. 



Fig. 



6. — Is a side view of tlie Noctiluca miliaris. The conical appearance of 

 the tooth is seen in this position. 



7. — A front view of the same parts, a, the outer surface of " the tooth ;" 



b, the oral aperture ; c, position of the supposed anal ap»rture. 

 8. — ^View in profile of the central depression, 



9. — Sectional view of the central depression and tooth, from behind. 

 10. — The nucleus enveloped in a membrane with yelk-like matter. 



